| 摘要 |
PROBLEM TO BE SOLVED: To simplify the response operation of a holding line and to realize extension service for making the selection of a holding call in an extension control system certain, in case of responding the holding call in an extension group of a private branch exchange. SOLUTION: A control unit 11 of a private branch exchange 10 comprises a means for examining whether a holding line in the extension group is only one at the time of response to a holding call in the extension group; and a holding call selection means 13 for selecting the holding call of the holding line, without the dial input of a line designation number, when the holding line is only one.
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